Method and apparatus for transmitting signal by NAN terminal in wireless communication system

Abstract

A method for transmitting a signal by a neighbor awareness networking (NAN) terminal in a wireless communication system, according to embodiment of the present invention, comprises the steps of: sensing a medium in a discovery window; selecting a back-off count value when the medium is in an occupied state; and transmitting a service discovery frame after performing countdown on the basis of the back-off count value, wherein an interval in which the back-off count value is determined on the basis of at least one of an interval in which a back-off count value for transmitting a synchronization beacon frame is selected, the length of the discovery window, and a hop count value of the terminal.

What is claimed is: 
     
       1. A method of transmitting a signal by a NAN (neighbor awareness networking) terminal in a wireless communication system, the method comprising:
 sensing a medium within a discovery window; 
 selecting a back-off count value when the medium is in an occupied state; and 
 transmitting a service discovery frame after performing countdown based on the back-off count value, 
 wherein an interval for selecting the back-off count value is determined based on at least one selected from the group consisting of an interval for selecting a back-off count value for transmission of a synchronization beacon frame, a length of the discovery window, and a value of a hop count of the terminal. 
 
     
     
       2. The method of  claim 1 , wherein when the hop count is 0, a minimum value of the interval for selecting the back-off count value is equal to or greater than a maximum value of the interval for selecting the back-off count value for the synchronization beacon frame transmission. 
     
     
       3. The method of  claim 1 , wherein when the hop count is 0, a minimum value of the interval for selecting the back-off count value is greater than a value obtained by subtracting a slot size corresponding to a length of the synchronization beacon frame from a maximum value of the interval for selecting the back-off count value for the synchronization beacon frame transmission. 
     
     
       4. The method of  claim 1 , wherein when the hop count is 1, a minimum value of the interval for selecting the back-off count value is equal to or greater than a minimum value of the interval for selecting the back-off count value for the synchronization beacon frame transmission. 
     
     
       5. The method of  claim 1 , wherein as the length of the discovery window increases, a minimum value of the interval for selecting the back-off count value increases. 
     
     
       6. The method of  claim 1 , wherein a maximum value of the interval for selecting the back-off count value is set to 500. 
     
     
       7. The method of  claim 1 , wherein when the hop count corresponds to a largest value in available values, a minimum value of the interval for selecting the back-off count value is greater than a maximum value of the interval for selecting the back-off count value for the synchronization beacon frame transmission. 
     
     
       8. The method of  claim 1 , wherein the terminal corresponds to a terminal serving as a master in a NAN cluster. 
     
     
       9. The method of  claim 1 , wherein when the medium is in the occupied state, the countdown is stopped. 
     
     
       10. The method of  claim 1 , wherein the terminal selects a random factor before the discovery window starts. 
     
     
       11. The method of  claim 1 , wherein the terminal selects a random factor immediately before transmitting the synchronization beacon frame. 
     
     
       12. The method of  claim 10 , wherein when a master rank determined based on the selected random factor is greater than a stored anchor master rank, the terminal serves as an anchor master. 
     
     
       13. A NAN (neighbor awareness networking) terminal in a wireless communication system, comprising:
 a receiving module; and 
 a processor, 
 wherein the processor is configured to sense a medium within a discovery window, to select a back-off count value when the medium is in an occupied state, and to transmit a service discovery frame after performing countdown based on the back-off count value and 
 wherein an interval for selecting the back-off count value is determined based on at least one selected from the group consisting of an interval for selecting a back-off count value for transmission of a synchronization beacon frame, a length of the discovery window, and a value of a hop count of the terminal.